I am 0.3 meters taller than him--此句语法对吗?对的话,为什么than后不用 he 而用 him

I am 0.3 meters taller than him--此句语法对吗?对的话,为什么than后不用 he 而用 him
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我记得：比较前后应该是并列的结构,如：
she is stronger than I--而没有用“me”
he studies harder than I--而没有用“me”